: Martin Henderson joined the cast as Dr. Nathan Riggs, whose arrival triggers a dark history for Owen Hunt involving his missing sister.
: Their developing romance culminates in a wedding in the season finale, though Amelia initially has doubts and runs away before the ceremony. Greys Anatomy - Season 12
'Grey's Anatomy' Season 12 Trailer: "Everything Has Changed" : Martin Henderson joined the cast as Dr
: A bitter custody battle over their daughter, Sofia, ensues when Callie plans to move to New York with Penny. Greys Anatomy - Season 12